Island



F. A. STEVENS. OPHTHALMIC MOUNTING. Armenian FILED mac. 3, I918.

1,308,964. lalvnted July 8, 1919.

2 SHtETS SHEET l.

F. A. STEVENS.

OPHTHALMiC MOUNTING. APPLICAHUN mm DEC.3. 1918.

1 ,308,964 Patented July 8, 1919.

2 SHtETS-SHEET 2.

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Afforn 6 y UNITED STATES PATENT OFFICE.

FREDERICK A. STEVENS, 0F PROVIDENCE, RHODE ISLAM D, ASSIGNOB. '10STEVENS AND COMPANY, INCORPORATED, A CORPORATION OF RHODE ISLAND.

ornrn'nmuc MOUNTING.

Specification 01' Letters Patent.

Patented July 8, 1919.

To all whom it may concern:

Be it known that I, FREDERICK A. Srnvmvs, citizen of the United States,residing at Providence, in the countyof Providence and 'State of RhodeIsland, have invented certain new and useful Improvements in OphthalmicMountings, of which the following is a specification.

My invention relates to ophthalmic mountings and has for its essentialobjects the prevention of accidental rotation or axial derangement ofthe lens without notching or renotching, and thereby weakenin the lens;to permit axial adjustment of t e lens for correcting astigmatlc defectsof vision and thereupon relocking the same; to enable a lens to be alied to a non-metallic rim without stretc mg the latter wherebydistortion and defacement of the rim by the heat is avoided; and topermit the insertion of a lens into a non-split metallic rim therebyavoiding the use of clamping screws.

To the above and other unenumerated and obvious ends my inventionconsists in such arts and combinations of parts as fall within the scopeof the appended claims.

In the accompanying drawings which form a part of this specification,and in which the invention is shown embodied in spectacles andeyeglasses- Figure 1 is a rear elevation of a complete pair ofspectacles,

Fig. 2, an enlarged rear elevation of a single detached rim,

Fig. 3, a section of the same on line 3-3 of Fig. 2,

Fi 4, an enlarged rear elevation of an auxi iary rim engaged with ametal rim, showing fragmentary adjacent portions of the spectacle frame,

Fig. 5, a section on line 5-5 of Fig. 4.

Fi 6 and 7, an elevation and plan respectlvely of the detached spectacleframe,

Fig. 8, a section corresponding to that of Fig. 5, showing amodification, and

' ig. 9, a rear elevation of a portion of an eyeglass embodying myinvention.

Like reference characters indicate like parts throughout the views.

In the construction illustrated 12 are endless or non-split rings ormetal rims, composed in the present instance of flat material, so thatthe circular members are of cylindrical form. These members areconnected by a bridge 18 fixed to adjacent portions of the rims. In theconstruction of spectacles, as shown in Fig. 7, non-split end pieces orblocks 15 are fixed to the portions of the rims 12 at points 0 osite thebridge. The blocks 15 have slots 1 in which are pivoted on pins 17 theflattenedend portions 19 of temp cs 20. In e eglasses, as shown in Fig.9, the blocks an temples are obviously omitted.

Applied to the members 12 are auxiliary rims 22, one of which is shownin Figs. 2 and 3. Such rim is preferably, but not necessarily, ofnon-metallic material common in this art such as celluloid or xylonite.This is provided in its rear side with a rectangular deep annular slot23 extending transversely of the rim a major portion of its thickness,forming annular outer and inner wing members 25 and 26 respectively: Thelatter member constitutes an annular tongue connected to its parallelmember 25, at its front portion, by a neck portion 27.

The bottom of the tongue is provided with an annular groove 29, V sha edin cross section in the present instance, orming resultant annularshoulders 30, also substantially V shaped in cross section, although theface 31 of the tongue 26 is in this case more strictly speakingtransversely curved. The rim 26 is transversely cut or slotted at anydesired number of points. In the case illustrated four of these slots 33are shown. These slots divide the annular tongue 26 into one or moreindependent tongues according to the number of slots. These segmentaltongues have a degree of resiliency dependent upon the material of theconstituent rim. If necessary the rear portion of the member 25 may beprovided with a notch 35.

The lens 37 1s of slightl greater diameter than the shoulders 30 on t etongues 26, and in this instance the lens periphery is shown V shaped orrounded in cross section. The lens is inserted into its seat 29 bypressing the ens against the face 31 of the member 26. In passi theshoulder 30 the lens raises the mem rs into the position of the brokenlines shown in Fig. 3, and as soon as the lens reaches its seat 29 themember snaps pack into its original position shown in full mes.

An auxilia rim 22 is applied to a rim 12 by pressing t e latterinto thechannel 23, after the lens has been inserted as described. This locksthe lens into its seat in the tongues.

The auxiliary rim is held in engagement with the metal rim by friction.It is sometimes convenient, but not essential, to supplement thefrictional engagement of the members 12 and 22 as follows. The ring 12,as shown in Fig. 8, is provided with a. threaded perforation 39 toreceive a screw 40 passing through an opening 41 in the member 22.

When applying the members 22 to an e eglass frame such as shown in Figs.6 an 7 the notch is sometimes convenient to receive the end piece 15. Inapplying the members 22 to an eyeglass frame, as shown in Fi 9, on whichthere is no end piece the use 0 a notch is superfluous.

Other modes of applying the rinciple of my invention may be employedinstead of the one explained provided the means stated by any ofthefollowing claims or the equivalent of such stated means be employed.

I claim: 7

1. In an ophthalmic mounting, the combination of an auxiliary rimprovided on its rear side with an annular slot to form a sheath for themain rim, and provided with an annular groove below the slot, a main rimin the slot, and a lens seated in the groove.

2. In an ophthalmic mounting, the combination of an auxiliary rimcomprising an endless outer peripheral portion, and an inner resilienttongue portion provided with a longitudinally curved groove, a lens inthe groove, and an endless rim between the peripheral portion and theton e portion.

3. In an ophthalmic mounting, the combination of an endless non-metallicrim provided in its rear side with an annular slot extendingtransversely of the rim a major portion of its thickness forming anendless peripheral portion and an inner tongue portion, said tongueportion being provided with an annular groove below the slot, an endlessrim seated in the slot, and a lens seated in the groove.

4. In an ophthalmic mounting, the combination of an auxiliary rimcomprising an outer peripheral portion, and a curved inner tongueportion, said tongue portion being provided with a longitudinallydisposed groove upon its inner portion, and with transversely disposedradially arranged slots, an endless rim embraced by both the peripheralportion and the tongue portion, and a lens in the groove.

In an ophthalmic mounting, the combi nation of an auxiliary non-metallicIl111 comprising an outer peripheral portion, and a resilient innertongue portion provided in its inner periphery with a groove, and withan annular lateral slot between the peripheral portion and the tongueportion, and a lens in the groove.

In testimony whereof I have afiixed my signature.

FREDERICK A. STEVENS.

